6.5 Alarm Detection
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 353
Digital Operator Display Minor Fault Name
FbL
PID Feedback Loss
T
he PID feedback input is lower than the level set in b5-13 for longer than the time set in b5-14 is set to 1 or 4.
Cause Possible Solutions
Minor Fault
(H
2- = 10)
Parameters settings for b
5-13 and b5-14 are
incorrect.
Check parameters b5-13 and b5-14.
YES
PID feedback wiring is faulty. Correct the wiring.
Feedback sensor has malfunctioned. Check the sensor and replace it if damaged.
Feedback input circuit is damaged.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact
YASKAWA or your nearest sales representative.
Digital Operator Display Minor Fault Name
Hbb
Safe Disable Signal Input
B
oth Safe Disable Input channels are open.
Cause Possible Solutions
Minor Fault
(H
2- = 10)
Both Safe Disable Inputs H1 and H2 are open.
• Check signal status at the input terminals H1 and H2.
• Check the Sink/Source Selection for the digital inputs.
• If the Safe Disable function is not utilized, check i
f the terminals H1-HC, and H2-HC are linked.
YES
Internally, both Safe Disable channels are broken.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact
YASKAWA or your nearest sales representative.
Digital Operator Display Minor Fault Name
HbbF
Safe Disable Signal Input
O
ne Safe Disable channel is open while the other one is closed.
Cause Possible Solutions
Minor Fault
(H
2- = 10)
The signals to the Safe Disable inputs are wrong or
t
he wiring is incorrect.
Check signal status at the input terminals H1 and H2. If the Safe Disable function is not utilized, the terminals
H1-HC, and H2-HC must be linked.
YES
One of the Safe Disable channels is faulty.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact
YASKAWA or your nearest sales representative.
Digital Operator Display Minor Fault Name
HCA
Current Alarm
D
rive current exceeded overcurrent warning level (150% of the rated current).
Cause Possible Solutions
Minor Fault
(H
2- = 10)
Load is too heavy.
E
ither reduce the load for applications with repetitive operation (repetitive stops and starts, etc.), or replace the
drive.
YES
Acceleration and deceleration times are too short.
• Calculate the torque required during accel
eration and for the inertia moment.
• If the torque level is not right for
the load, take the following steps:
• Increase the acceleration and deceleration time
s (C1-01 through C1-08).
• Increase the capacity of the drive.
A special-purpose motor is being used, or the drive is
at
tempting to run a motor greater than the maximum
allowable capacity.
• Check the motor capacity.
• Use a motor appropriate for the drive. Ensure the
motor is within the allowable capacity range.
The current level increased due to Speed Search after
a momentary power loss or while attempting to
perform a fault restart.
The alarm will appear only briefly. There is no need to take action to prevent the alarm from occurring in such
instances.
Digital Operator Display Minor Fault Name
LT-1
Cooling Fan Maintenance Time
T
he cooling fan has reached its expected maintenance period and may need to be replaced.
Note: If H2- = 2F, the signal will close at the maintenance period. The signal will not close if H2- = 10.
Cause Possible Solutions
Maintenance
Ti
me
(H2- = 2F)
The cooling fan has reached 90% of its expected
per
formance life.
Replace the cooling fan and reset the Maintenance Monitor by setting o4-03 to 0. YES
Digital Operator Display Minor Fault Name
LT-2
Capacitor Maintenance Time
T
he main circuit and control circuit capacitors are nearing the end of their expected performance life.
Note: If H2- = 2F, the signal will close at the maintenance period. The signal will not close if H2- = 10.
Cause Possible Solutions
Maintenance
Ti
me
(H2- = 2F)
The main circuit and control circuit
capacitors have
reached 90% of their expected performance life.
Replace the drive.
YES
Digital Operator Display Minor Fault Name
LT-3
Soft Charge Bypass Re
lay Maintenance Time
The DC bus soft charge relay is nearing the end of its expected performance life.
Note: If H2- = 2F, the signal will close at the maintenance period. The signal will not close if H2- = 10.
Cause Possible Solutions
Maintenance
Ti
me
(H2- = 2F)
The DC bus soft charge relay has reached 90% of
t
heir expected performance life.
Replace the drive. YES
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